Log in to "My office", call "My Ads". In the list, find the ad that you want to edit or delete.
Click on it with the left mouse button, a form with your ad will appear in which you can correct the category, title, ad text, and language. In the latter case your ad will be translated into another language using the Yandex service.
To save the changes, click the "Submit" button. After that your ad will be published in the corrected form.
The form is provided with a prompt in the form of a question mark (?).